/*

   +--------------+    
   | Book         |    
   +--------------+    
   | String title |     
   | String author|    
   | int    year  |      
   +--------------+    

 */  

//to represent a book
class Book implements ISame{

  String title;
  String author;
  int    year;

  Book(String title, String author, int year){
    this.title=title;
    this.author=author;
    this.year=year;
  }

  //is this book the same as that object   
  public boolean same(ISame that){ 
    if (that instanceof Book)
      return this.title.equals(((Book)that).title)
      && this.author.equals(((Book)that).author)
      && this.year==((Book)that).year;
    else 
      return false; 
  } 
}